Figure 5-18. Desorption electrospray ionization (DESI) mass spectrometry (MS) scan of the first dimension separation of peptides leucine enkephalin, bradykinin, angiotensin II, and val-tyr-val achieved in the 30 mm long virtual channel grafted with the 2-acrylamido-2-methyl-1-propanesulfonic acid-2-hydroxyethyl methacrylate mixture (top spectrum) and DESI-MS spectra of individual peptides.

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